What this -12 V regulator brings to the board
The ON Semiconductor MC79L12ACDR is a fixed -12 V negative linear regulator in an 8-SOIC surface-mount package, rated for 100 mA continuous output. The 42 dB PSRR at 120 Hz attenuates rectified mains ripple.
Package and mounting — what the 8-SOIC footprint means
The 8-SOIC body (3.90 mm width, 0.154" pitch) is the standard narrow SOIC footprint. It's a direct drop-in for any 8-pin SOIC negative regulator layout — no adapter board, no lead bending. The surface-mount package suits automated assembly lines and rework stations alike. The supplier device package is 8-SOIC, same as the case code, so the pick-and-place file is straightforward. Tape & Reel or Cut Tape options cover both production runs and prototype quantities.
Temperature grade — where it lives and where it doesn't
Rated 0°C to 125°C operating junction temperature. The 125°C upper limit is junction temp, not ambient — derate for self-heating at 100 mA.
Sourcing and lifecycle — active and available
Product status is Active, with ROHS3 compliance. For the BOM line, that means no supply-risk premium and no need to qualify a drop-in replacement for a production run.